220513445 has 4 divisors (see below), whose sum is σ = 264616140. Its totient is φ = 176410752.

The previous prime is 220513429. The next prime is 220513459. The reversal of 220513445 is 544315022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544315022 = 2 ⋅272157511.

It can be written as a sum of positive squares in 2 ways, for example, as 106151809 + 114361636 = 10303^2 + 10694^2 .

It is a cyclic number.

It is not a de Polignac number, because 220513445 - 2⁴ = 220513429 is a prime.

It is a super-4 number, since 4×220513445⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22051340 + ... + 22051349.

It is an arithmetic number, because the mean of its divisors is an integer number (66154035).

Almost surely, 2^220513445 is an apocalyptic number.

It is an amenable number.

220513445 is a deficient number, since it is larger than the sum of its proper divisors (44102695).

220513445 is an equidigital number, since it uses as much as digits as its factorization.

220513445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44102694.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 220513445 is about 14849.6951147153. The cubic root of 220513445 is about 604.1503406660.

Adding to 220513445 its reverse (544315022), we get a palindrome (764828467).

The spelling of 220513445 in words is "two hundred twenty million, five hundred thirteen thousand, four hundred forty-five".